My Dog’s Leg sees a father creating a fantasy story to explain to his daughter how their dog lost her leg. He tells a tale of a monster that steals the dog’s leg leading the dad and dog on an adventure to retrieve it.

Chaos ensues in an idyllic beach town, when thirteen-year-old Niki, convinced she's ready to be an adult, plans a heist to watch an R-rated movie leading to irrevocable consequences with her family.